I am getting an error message concerning the estimation of confidence
intervals when fitting a mixed model and don't know what the problem is,
or its solution.

 

Just to provide context: the model is describing the effects of age,
exp(age), harvest age, and climate variables on bighorn horn annular
length.

 

The data structure is repeated measures (between individuals, within
individuals over time).

 

Id is a random effect (there are between 3-11 horn measurements per ram,
one horn measurement per age, over the 25 year period in the dataset).

 

The mixed effect results is unable to provide confidence intervals for
the fixed and random effects because: of an error in the
variance-covariance structure. The error says that the intervals are
non-positive definitive. 

 

 

Bill Shipley

 


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